GoPro Hero 4: Everything You Need to Know - Outside Online
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Amazon.com : GoPro Hero4 Black : Electronics
GoPro Hero4 Black Edition review | Stuff
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GoPro Goes 4K with HERO4 Black, Adds Touchscreen to HERO4 Silver, and Debuts $130 Entry-Level HERO | PetaPixel
GoPro HERO4 Camcorders
GoPro Hero4 Black review: Smooth 4K video that's still the best in the category - CNET
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GoPro Launches HERO4 Session: the Smallest, Lightest and Most Convenient GoPro, Yet | GoPro
GoPro Hero4 vs. GoPro Hero3+
GoPro Hero4 Silver review: Hero4 Silver is the best GoPro for the money - CNET